change getAllGroups to getAllRichGroupsWithAttrsByName in VoGroupsTabItem
Optimalization of toString methods

- toString and serializeToString methods in beans optimalized, '+' substituted by StringBuilder
Add chmod and chown on files created in script sshkeys

 - modify slave script sshkeys: if .ssh directory or .ssh/authorized_keys
  file is created by this script, change ownership on this file and
  directory to USER (to who belongs to). Also change permissions on file
  to 644 and directory to 755 if they are newly created there.
 - add this change to debian changelog
Merge pull request #488 from stavamichal/fixInSshKeySlaveScript

Add chmod and chown on files created in script sshkeys
Add work with dirPermissions in scratchLocal script

  - umask setting create by gen script
  - umask setting read from file by slave script
Merge pull request #498 from stavamichal/fsScratchLocalSetRightsForNewDirectories

Add work with dirPermissions in scratchLocal script
Fix method getRichSubGroupsWithAttributesByNames

This method returned all groups within VO. Now it returns only subgroups.
add clicable sync column to VO groups and group subgroups.
add new cell definition - CustomClicableInfoCellWithImageResource
change load class from Group to RichGroup
GUI: skip warning if at least one item is marked for deletion.
Merge pull request #499 from zlamalp/testing

GUI: skip warning if at least one item is marked for deletion.
GUI: optimized workflow with attribute definitions

- Use filtering when refreshing attr def table.
- Allow to set rights on creation.
- Less table loading on delete and update
  (just de-select or remove from table).
Merge pull request #500 from zlamalp/attrs

GUI: optimized workflow with attribute definitions
Change bullets for rendering sync state and change texts in info box
Merge branch 'master' of github.com:ondrejvelisek/perun into ondrejvelisek-master
GUI: Optimized RichGroup

- RichGroup extends Group.
- Moved column to left, smaller column.
- Tweaked texts in info box.
- Removed DeleteRichGroups, use simple DeleteGroups.
CORE: Simplified and exact authorization for group admin and subgroups.

- Specify VO for GroupAdmin in GetAllRichGroupsWithAttributesByNames.
- Use only parentGroup for VoAdmin in GetRichSubGroupsWithAttributesByNames.
  to save up one DB select.
Merge pull request #501 from ondrejvelisek/master

- Add column with information about group synchronization in a table.
- Merged with local changes.
fix undefined sync group timestamp - Escape the dot
fix undefined sync subGroup timestamp - Escape the dot
Merge pull request #502 from ondrejvelisek/master

Fix undefined last synchronization group timestamp